US3718720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing fibrous, carbonaceous composites having near isotropic properties
Assignee: United States Atomic Energy Commission
•
Filing: 1971-01-12
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Granted: 1973-02-27
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Expires: 1991-01-12
Abstract
Abstract In the preparation of carbonaceous fiber composites a method has been found for controlling the orientation of the fibers whereby composites exhibiting near isotropic properties may be readily fabricated. The method comprises mixing discrete carbonaceous fibers with a particulate thermoplastic binder, heating the mixture sufficiently to melt the binder and attach the intermingled fibers at their nexus, cooling the attached fibers, crushing the fibrous mass into small agglomerates, forming the agglomerates into the desired shape, and thereafter heating the agglomerates to a temperature adequate for successively melting the binder to join together the fibers and converting the binder to carbon.
Inventors
- 👤 F Lambdin
- 👤 W Randles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:31
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/71; C04B35/78; C04B35/80; C04B35/83; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
The method of preparing a fibrous composite as claimed in claim 1, wherein the binder is sufficiently melted during the step of heating the mixture to flow on said fibers and form droplets at said junctures.
Claim 2
Dependent Claim
38 words
The method of preparing a fibrous composite as claimed in claim 2, wherein the step of heating the mixture is achieved in a flexible container subjected to vacuum, and wherein excess binder forms a coating on said fibers.
References Cited (Backward Citations)
US3246056A
Cited
US3462289A
Cited
US3470003A
Cited
US3534803A
Cited
US3517092A
Cited
US3573086A
Cited
US3666847A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |